(h) Modification, Alteration, Amendment or Vacation. In Whole or In Part of Plat After Approval. No modification, alteration, amendment, or vacation, in whole or in part, of a final plat except for the addition of appropriate easements as approved by the Village Engineer shall be made in or to a final plat approved by Council under the provisions of this Section or another political subdivision prior to annexation unless such modification, alteration, amendment, or vacation, in whole or in part, is first submitted to and accepted by the Service Director, is recommended by the Planning Commission, and Council approves such modification, alteration, amendment, or vacation, in whole or in part, by ordinance. If the modified, altered, amended, or vacated, in whole or in part, final plat is approved by Council, the owner shall file and record the plat with the County Recorder within sixty days. If the final plat has already been recorded then the owner shall file and record the ordinance and an authenticating affidavit executed by the Clerk of Council with the County Recorder within sixty days, wherein the modified, altered, amended, or vacated, in whole or in part, plat shall be indexed or cross- referenced with the original plat. If the plat is not filed with the County Recorder within sixty days, the modification, alteration, amendment, or vacation, in whole or in part, is void and is of no effect.